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Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Number of  Shares        
Outstanding, beginning (in shares) 210 0    
Granted (in shares) 0 210    
Exercised (in shares) 0 0    
Forfeited (in shares) 0 0    
Outstanding, ending (in shares) 210 210    
Stock options exercisable (in shares) 210      
Weighted Average  Exercise Price        
Weighted Average Exercise Price, beginning (in dollars per share) $ 3.14 $ 0    
Granted (in dollars per share) 0 3.14    
Exercised (in dollars per share) 0 0    
Forfeited (in dollars per share) 0 0    
Weighted Average Exercise Price, ending (in dollars per share) 3.14 $ 3.14    
Stock options exercisable (in dollars per share) $ 3.14      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]        
Weighted Average Remaining Contractual Life (Years), Outstanding 5 years 2 months 4 days 6 years 2 months 8 days    
Weighted Average Remaining Contractual Life (Years), Exercisable 5 years 2 months 4 days      
Aggregate Intrinsic Value, Outstanding $ 407 $ 483 $ 0 $ 0
Aggregate Intrinsic Value, Exercisable $ 407